Published at 9:29 PM PDT on May 14, 2012 | Updated at 9:33 PM PDT on May 14, 2012

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Katherine Jenkins took a tumble and hurt her back on Monday's edition of "Dancing with the Stars."

Katherine Jenkins suffered a back injury while performing on Monday's "Dancing with the Stars" semifinals.

At press time, it was not clear how serious the Welsh classical singer's injury was, but she was well enough to be present for the traditional show closing, which features all the couples. However, as the cameras panned to Katherine, who was being comforted by her professional dancing partner Mark Ballas, she looked to be in pain.

It was during the singer's second competition number – at the tail end of the pair's salsa – that she appeared to suffer the injury.

Mark spun Katherine around, she did a backbend, and as he was stepping over her, she seemed unable to support herself and fell to the ground. The singer quickly got up, and tried to finish the number, but fans could see her wincing.

An Access Hollywood producer spotted Katherine wearing an ice pack backstage shortly thereafter and at the end of the show, co-host Tom Bergeron said Katherine would be receiving medical attention.

Sadly, for Katherine, the slip at the end of the salsa cost the couple greatly as they landed at the bottom of the leaderboard, one point behind Donald Driver and Peta Murgatroyd, who ended the night in third with 57 out of 60.

While Katherine slipped in the rankings, Maria Menounos took the top leaderboard spot with her partner, Derek Hough. Their first number, an Argentine tango, earned a perfect 30.

During their second number, Len caught a minor misstep that cost them one point, for a total of 59 out of 60 for the night.

Maria and Derek may have impressed the judges, but William Levy and Cheryl Burke were nipping at their heels, ending the night in second place with 58 points, 1 point off a tie for the top spot.

A tango to "Sweet Dreams" wowed judge Bruno Tonioli, who said William looked "like the dictator" of the dance, and earned the couple 28 points, but perhaps the most memorable number of the night was the pair's saucy samba in Round 2.

The telenovela star shook his bon bon as well as Ricky Martin, leaving Carrie Ann panting so much, she had to grab a drink of water.